The ground under Tepich, Mexico — measured by the Global Seismographic Network (IRIS/USGS) station IU TEIG and redrawn here every 15 minutes. A thin band means a quiet ground; a tall spike is a passing earthquake, near or on the other side of the planet.
| Mag | Where | When | Distance |
|---|---|---|---|
| M5.6 | 91 km SW of Tamarindo, Costa Rica | 1970-01-01 00:00 UTC | 1,177 km |
| M5.2 | 86 km SW of Brisas Barra de Suchiate, Mexico | 1970-01-01 00:00 UTC | 842 km |
| M4.9 | 65 km WSW of Aquiles Serdán, Mexico | 1970-01-01 00:00 UTC | 801 km |
| M4.9 | 115 km SW of Puerto Madero, Mexico | 1970-01-01 00:00 UTC | 865 km |
| M4.9 | 68 km WSW of San Juan del Sur, Nicaragua | 1970-01-01 00:00 UTC | 1,031 km |
| M4.8 | 17 km S of Nandaime, Nicaragua | 1970-01-01 00:00 UTC | 988 km |
| M4.8 | 7 km WSW of Soconusco, Mexico | 1970-01-01 00:00 UTC | 729 km |
| M4.7 | 95 km SW of Brisas Barra de Suchiate, Mexico | 1970-01-01 00:00 UTC | 853 km |
| M4.6 | 18 km NNE of Posoltega, Nicaragua | 1970-01-01 00:00 UTC | 851 km |
| M4.6 | 105 km SSW of Masachapa, Nicaragua | 1970-01-01 00:00 UTC | 1,048 km |
| Mag | Where | When | Distance |
|---|---|---|---|
| M7.7 | 12 km WSW of Pitaloza Arriba, Panama | 1970-01-01 00:00 UTC | 1,621 km |
| M7.0 | 191 km ENE of Nagqu, China | 1970-01-01 00:00 UTC | 14,161 km |
| M6.9 | 76 km NE of Ozernovskiy, Russia | 1970-01-01 00:00 UTC | 9,797 km |
| M6.9 | 197 km WNW of Port-Olry, Vanuatu | 1970-01-01 00:00 UTC | 12,201 km |
| M6.8 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 7,824 km |
| M6.7 | central Mid-Atlantic Ridge | 1970-01-01 00:00 UTC | 7,755 km |
Waves from a large earthquake reach this station minutes later — up to about 20 minutes from the far side of the Earth. Look for a spike in the helicorder at that time.